My pleasure! I'll try and answer as clear as I can recall:
-Unfortunately, I am unable to remember if a White Enemy was involved with the sudden lack of movement, however, it was purely after having dashed around the circuit. As I realigned myself to enter the left zone's edge, I attempted to jump and as soon as the motion began, I froze and dropped to the floor. Proceeded to get swarmed by enemies. A similar issue happened 2 more times, under similar set ups. I hypothesise it had something to do with changing directions, but was unable to replicate it by choice.
-Pretty much what I expected! I wasn't too surprised that I started taking damage as the sprites were in contact, but felt worthwhile to point out.
-Exactly! Those I-frames were pretty much what got me through the game consistently, and I was unsure if it being left to discover was intentional or not. If it is supposed to be known by the player before starting, I would include it in the instructions.